Why are weekends special?

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Across
  1. 3. 1
  2. 5. 6
  3. 7. 3
  4. 9. 7
  5. 10. 4
Down
  1. 1. 8
  2. 2. 9
  3. 4. 10
  4. 6. 2
  5. 8. 5